<template>
  <div id="app">
    <router-view />
  </div>
</template>

<script>
export default {
  name: 'App',
  created() {
    // 在页面加载时读取sessionStorage里的状态信息
    if (sessionStorage.getItem('store')) {
      this.$store.replaceState(Object.assign({}, this.$store.state, JSON.parse(sessionStorage.getItem('store'))))
    }
 
    // 在页面刷新时将vuex里的信息保存到sessionStorage里
    window.addEventListener('beforeunload', () => {
      sessionStorage.setItem('store', JSON.stringify(this.$store.state))
    })
  }
}
</script>
<style>
  body {
    background:url("assets/img/home/bg.png") no-repeat;
    background-size: cover;
    background-attachment: fixed;
    min-width: 860px;
  }
  #app{
    background: url("assets/img/home/tl.png") no-repeat left top, url("assets/img/home/tr.png") no-repeat right top,
    url("assets/img/home/bl.png") no-repeat left bottom, url("assets/img/home/br.png") no-repeat right bottom;
    background-size: 180px auto;
  }
</style>
